diff --git a/ap/libc/glibc/glibc-2.23/string/test-strcmp.c b/ap/libc/glibc/glibc-2.23/string/test-strcmp.c
new file mode 100644
index 0000000..8d4772a
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/string/test-strcmp.c
@@ -0,0 +1,409 @@
+/* Test and measure strcmp and wcscmp functions.
+   Copyright (C) 1999-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Written by Jakub Jelinek <jakub@redhat.com>, 1999.
+   Added wcscmp support by Liubov Dmitrieva <liubov.dmitrieva@gmail.com>, 2011.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#define TEST_MAIN
+#ifdef WIDE
+# define TEST_NAME "wcscmp"
+#else
+# define TEST_NAME "strcmp"
+#endif
+#include "test-string.h"
+
+#ifdef WIDE
+# include <wchar.h>
+
+# define L(str) L##str
+# define STRCMP wcscmp
+# define STRCPY wcscpy
+# define STRLEN wcslen
+# define MEMCPY wmemcpy
+# define SIMPLE_STRCMP simple_wcscmp
+# define STUPID_STRCMP stupid_wcscmp
+# define CHAR wchar_t
+# define UCHAR wchar_t
+# define CHARBYTES 4
+# define CHARBYTESLOG 2
+# define CHARALIGN __alignof__ (CHAR)
+# define MIDCHAR 0x7fffffff
+# define LARGECHAR 0xfffffffe
+# define CHAR__MAX WCHAR_MAX
+# define CHAR__MIN WCHAR_MIN
+
+/* Wcscmp uses signed semantics for comparison, not unsigned */
+/* Avoid using substraction since possible overflow */
+
+int
+simple_wcscmp (const wchar_t *s1, const wchar_t *s2)
+{
+  wchar_t c1, c2;
+  do
+    {
+      c1 = *s1++;
+      c2 = *s2++;
+      if (c2 == L'\0')
+      return c1 - c2;
+    }
+  while (c1 == c2);
+
+  return c1 < c2 ? -1 : 1;
+}
+
+int
+stupid_wcscmp (const wchar_t *s1, const wchar_t *s2)
+{
+  size_t ns1 = wcslen (s1) + 1;
+  size_t ns2 = wcslen (s2) + 1;
+  size_t n = ns1 < ns2 ? ns1 : ns2;
+  int ret = 0;
+
+  wchar_t c1, c2;
+
+  while (n--) {
+    c1 = *s1++;
+    c2 = *s2++;
+    if ((ret = c1 < c2 ? -1 : c1 == c2 ? 0 : 1) != 0)
+      break;
+  }
+  return ret;
+}
+
+#else
+# include <limits.h>
+
+# define L(str) str
+# define STRCMP strcmp
+# define STRCPY strcpy
+# define STRLEN strlen
+# define MEMCPY memcpy
+# define SIMPLE_STRCMP simple_strcmp
+# define STUPID_STRCMP stupid_strcmp
+# define CHAR char
+# define UCHAR unsigned char
+# define CHARBYTES 1
+# define CHARBYTESLOG 0
+# define CHARALIGN 1
+# define MIDCHAR 0x7f
+# define LARGECHAR 0xfe
+# define CHAR__MAX CHAR_MAX
+# define CHAR__MIN CHAR_MIN
+
+/* Strcmp uses unsigned semantics for comparison. */
+int
+simple_strcmp (const char *s1, const char *s2)
+{
+  int ret;
+
+  while ((ret = *(unsigned char *) s1 - *(unsigned char*) s2++) == 0 && *s1++);
+  return ret;
+}
+
+int
+stupid_strcmp (const char *s1, const char *s2)
+{
+  size_t ns1 = strlen (s1) + 1;
+  size_t ns2 = strlen (s2) + 1;
+  size_t n = ns1 < ns2 ? ns1 : ns2;
+  int ret = 0;
+
+  while (n--)
+    if ((ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) != 0)
+      break;
+  return ret;
+}
+#endif
+
+typedef int (*proto_t) (const CHAR *, const CHAR *);
+
+IMPL (STUPID_STRCMP, 1)
+IMPL (SIMPLE_STRCMP, 1)
+IMPL (STRCMP, 1)
+
+static int
+check_result (impl_t *impl,
+	     const CHAR *s1, const CHAR *s2,
+	     int exp_result)
+{
+  int result = CALL (impl, s1, s2);
+  if ((exp_result == 0 && result != 0)
+      || (exp_result < 0 && result >= 0)
+      || (exp_result > 0 && result <= 0))
+    {
+      error (0, 0, "Wrong result in function %s %d %d", impl->name,
+	     result, exp_result);
+      ret = 1;
+      return -1;
+    }
+
+  return 0;
+}
+
+static void
+do_one_test (impl_t *impl,
+	     const CHAR *s1, const CHAR *s2,
+	     int exp_result)
+{
+  if (check_result (impl, s1, s2, exp_result) < 0)
+    return;
+}
+
+static void
+do_test (size_t align1, size_t align2, size_t len, int max_char,
+	 int exp_result)
+{
+  size_t i;
+
+  CHAR *s1, *s2;
+
+  if (len == 0)
+    return;
+
+  align1 &= 63;
+  if (align1 + (len + 1) * CHARBYTES >= page_size)
+    return;
+
+  align2 &= 63;
+  if (align2 + (len + 1) * CHARBYTES >= page_size)
+    return;
+
+  /* Put them close to the end of page.  */
+  i = align1 + CHARBYTES * (len + 2);
+  s1 = (CHAR *) (buf1 + ((page_size - i) / 16 * 16) + align1);
+  i = align2 + CHARBYTES * (len + 2);
+  s2 = (CHAR *) (buf2 + ((page_size - i) / 16 * 16)  + align2);
+
+  for (i = 0; i < len; i++)
+    s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
+
+  s1[len] = s2[len] = 0;
+  s1[len + 1] = 23;
+  s2[len + 1] = 24 + exp_result;
+  s2[len - 1] -= exp_result;
+
+  FOR_EACH_IMPL (impl, 0)
+    do_one_test (impl, s1, s2, exp_result);
+}
+
+static void
+do_random_tests (void)
+{
+	UCHAR *p1 = (UCHAR *) (buf1 + page_size - 512 * CHARBYTES);
+	UCHAR *p2 = (UCHAR *) (buf2 + page_size - 512 * CHARBYTES);
+
+	for (size_t n = 0; n < ITERATIONS; n++)
+	  {
+	    /* for wcscmp case align1 and align2 mean here alignment
+	       in wchar_t symbols, it equal 4*k alignment in bytes, we
+	       don't check other alignments like for example
+	       p1 = (wchar_t *)(buf1 + 1)
+	       because it's wrong using of wchar_t type.  */
+	    size_t align1 = random () & 31;
+	    size_t align2;
+	    if (random () & 1)
+	      align2 = random () & 31;
+	    else
+	      align2 = align1 + (random () & 24);
+	    size_t pos = random () & 511;
+	    size_t j = align1 > align2 ? align1 : align2;
+	    if (pos + j >= 511)
+	      pos = 510 - j - (random () & 7);
+	    size_t len1 = random () & 511;
+	    if (pos >= len1 && (random () & 1))
+	      len1 = pos + (random () & 7);
+	    if (len1 + j >= 512)
+	      len1 = 511 - j - (random () & 7);
+	    size_t len2;
+	    if (pos >= len1)
+	      len2 = len1;
+	    else
+	      len2 = len1 + (len1 != 511 - j ? random () % (511 - j - len1) : 0);
+	    j = (pos > len2 ? pos : len2) + align1 + 64;
+	    if (j > 512)
+	      j = 512;
+	    for (size_t i = 0; i < j; ++i)
+	      {
+		p1[i] = random () & 255;
+		if (i < len1 + align1 && !p1[i])
+		  {
+		    p1[i] = random () & 255;
+		    if (!p1[i])
+		      p1[i] = 1 + (random () & 127);
+		  }
+	      }
+	    for (size_t i = 0; i < j; ++i)
+	      {
+		p2[i] = random () & 255;
+		if (i < len2 + align2 && !p2[i])
+		  {
+		    p2[i] = random () & 255;
+		    if (!p2[i])
+		      p2[i] = 1 + (random () & 127);
+		  }
+	      }
+
+	    int result = 0;
+	    MEMCPY (p2 + align2, p1 + align1, pos);
+	    if (pos < len1)
+	      {
+		if (p2[align2 + pos] == p1[align1 + pos])
+		  {
+		    p2[align2 + pos] = random () & 255;
+		    if (p2[align2 + pos] == p1[align1 + pos])
+		      p2[align2 + pos] = p1[align1 + pos] + 3 + (random () & 127);
+		  }
+
+		if (p1[align1 + pos] < p2[align2 + pos])
+		  result = -1;
+		else
+		  result = 1;
+	      }
+	    p1[len1 + align1] = 0;
+	    p2[len2 + align2] = 0;
+
+	    FOR_EACH_IMPL (impl, 1)
+	      {
+		int r = CALL (impl, (CHAR *) (p1 + align1), (CHAR *) (p2 + align2));
+		/* Test whether on 64-bit architectures where ABI requires
+		   callee to promote has the promotion been done.  */
+		asm ("" : "=g" (r) : "0" (r));
+		if ((r == 0 && result)
+		    || (r < 0 && result >= 0)
+		    || (r > 0 && result <= 0))
+		  {
+		    error (0, 0, "Iteration %zd - wrong result in function %s (align in bytes: %zd, align in bytes: %zd, len1:  %zd, len2: %zd, pos: %zd) %d != %d, p1 %p p2 %p",
+			   n, impl->name, (size_t) (p1 + align1) & 63, (size_t) (p1 + align2) & 63, len1, len2, pos, r, result, p1, p2);
+		    ret = 1;
+		  }
+	      }
+     }
+}
+
+static void
+check (void)
+{
+  CHAR *s1 = (CHAR *) (buf1 + 0xb2c);
+  CHAR *s2 = (CHAR *) (buf1 + 0xfd8);
+
+  STRCPY(s1, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrs"));
+  STRCPY(s2, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkLMNOPQRSTUV"));
+
+  /* Check correct working for negatives values */
+
+  s1[0] = 1;
+  s2[0] = 1;
+  s1[1] = 1;
+  s2[1] = 1;
+  s1[2] = -1;
+  s2[2] = 3;
+  s1[3] = 0;
+  s2[3] = -1;
+
+  /* Check possible overflow bug, actual more for wcscmp */
+
+  s1[7] = CHAR__MIN;
+  s2[7] = CHAR__MAX;
+
+  size_t l1 = STRLEN (s1);
+  size_t l2 = STRLEN (s2);
+
+  for (size_t i1 = 0; i1 < l1; i1++)
+    for (size_t i2 = 0; i2 < l2; i2++)
+      {
+		int exp_result = SIMPLE_STRCMP (s1 + i1, s2 + i2);
+		FOR_EACH_IMPL (impl, 0)
+		check_result (impl, s1 + i1, s2 + i2, exp_result);
+      }
+
+  /* Test cases where there are multiple zero bytes after the first.  */
+
+  for (size_t i = 0; i < 16 + 1; i++)
+    {
+      s1[i] = 0x00;
+      s2[i] = 0x00;
+    }
+
+  for (size_t i = 0; i < 16; i++)
+    {
+      int exp_result;
+
+      for (int val = 0x01; val < 0x100; val++)
+	{
+	  for (size_t j = 0; j < i; j++)
+	    {
+	      s1[j] = val;
+	      s2[j] = val;
+	    }
+
+	  s2[i] = val;
+
+	  exp_result = SIMPLE_STRCMP (s1, s2);
+	  FOR_EACH_IMPL (impl, 0)
+	    check_result (impl, s1, s2, exp_result);
+	}
+    }
+}
+
+
+int
+test_main (void)
+{
+  size_t i;
+
+  test_init ();
+  check();
+
+  printf ("%23s", "");
+  FOR_EACH_IMPL (impl, 0)
+    printf ("\t%s", impl->name);
+  putchar ('\n');
+
+  for (i = 1; i < 32; ++i)
+    {
+      do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 0);
+      do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 1);
+      do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, -1);
+    }
+
+  for (i = 1; i < 10 + CHARBYTESLOG; ++i)
+    {
+      do_test (0, 0, 2 << i, MIDCHAR, 0);
+      do_test (0, 0, 2 << i, LARGECHAR, 0);
+      do_test (0, 0, 2 << i, MIDCHAR, 1);
+      do_test (0, 0, 2 << i, LARGECHAR, 1);
+      do_test (0, 0, 2 << i, MIDCHAR, -1);
+      do_test (0, 0, 2 << i, LARGECHAR, -1);
+      do_test (0, CHARBYTES * i, 2 << i, MIDCHAR, 1);
+      do_test (CHARBYTES * i, CHARBYTES * (i + 1), 2 << i, LARGECHAR, 1);
+    }
+
+  for (i = 1; i < 8; ++i)
+    {
+      do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 0);
+      do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 0);
+      do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 1);
+      do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 1);
+      do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, -1);
+      do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, -1);
+    }
+
+  do_random_tests ();
+  return ret;
+}
+
+#include "../test-skeleton.c"